Langdon Alger is a Springfield Elementary School student. He is very quiet and enjoys puzzles. Lisa has a brief crush on him, and she shares this with Homer when she is bonding with him while hanging out at the nuclear plant.[1]

He later appears in a Simpsons Comics issue, where he asks Lisa out to make Janey Powell jealous and ends up punch-dumped on his head by her.

In a game called Shin Megami Tensei: Strange Journey, some of the official screenshots used in the USA manual for the protagonist is named Langdon Alger, Lance Murdock, and many other characters from The Simpsons.

In Bart on the Road, the character is never actually shown, implying to TV series viewers that he might not actually exist and be something Lisa made up. His appearing in the comics, however, shows that he is indeed real.

There is a concept album called Following The Lizard Queen by a musician called Landon Alger, which was released on Valentines day 2014.

He looks strikingly similar to Jessica Lovejoy's boyfriend from the end of Bart's Girlfriend, but it is not explicitly stated whether or not they are the same character.